The attacked in Israel are now trumping their attackers because, in the spirit of Old Ironsides and the ironclads, Israel developed the Iron Dome antimissile system, Israeli Ambassador to the U.S. Michael Oren writes Thursday, December 6, in The Wall Street Journal. From drawing board to deployment in 2011, Israel completed the Iron Dome in a mere three years. The first two batteries—developed and financed entirely by Israel—took down dozens of Hamas rockets, making Iron Dome the first antimissile system ever to succeed in combat. The generous support of President Obama and the U.S. Congress enabled the construction of four additional batteries. This innovation will not only protect Israel but enhance security for America and its allies world-wide. Yet no air-defense system is foolproof, and robust offensive capabilities remain necessary to protect Israelis from harm. Iron hulls once made war ships invulnerable, but the skies cannot be armored. At least Iron Dome, along with the Arrow and David’s Sling missile defense systems, makes them safer.